A bell tolled three times as a solemn Trump, flanked by first lady Melania Trump, Vice President Mike Pence and his wife, Karen, paused on the South Lawn for a moment of silence in honor of the shooting victims.

Videos Capture Moment Vegas Gunman Opens Fire

Videos recorded by concert-goers at the Route 91 Harvest Festival in Las Vegas show the moment shots rained down on Oct. 1, 2017. Police said Stephen Paddock, 64, killed at least 59 people and wounded 527 others when he opened fire at the crowd from the 32nd floor of the nearby Mandalay Bay Resort and Casino.

(Published Monday, Oct. 2, 2017)

Flags over the U.S. Capitol were ordered to be lowered to half-staff Monday, House Speak Paul Ryan said.

"This evil tragedy horrifies us all. To the people of Las Vegas and to the families of the victims, we are with you during this time," Ryan said in a statement.

My warmest condolences and sympathies to the victims and families of the terrible Las Vegas shooting. God bless you!

The gunman, who took aim at the crowd as country music star Jason Aldean was performing, was killed on the the 32nd floor of a casino on the Las Vegas Strip. He was identified as 64-year-old Stephen Paddock of Mesquite, Nevada.

Clark County Sheriff Joseph Lombardo said it was believed to be a "lone wolf" attack.

Video Shows People Flee Mass Shooting on Vegas Strip

Video shows people feeling a country music festival in Las Vegas after a gunman opened fire from inside the Mandalay Bay Resort and Casino. Authorities said that more than 50 people were killed and more than 500 wounded.

(Published Monday, Oct. 2, 2017)

Asked if Trump wants to use the shooting to launch into a policy discussion about gun control, White House press secretary Sarah Huckabee Sanders said now is not the time to discuss policy.

"There’s a time and place for a political debate," she said at a White House press briefing Monday afternoon. "Now is the time to unite as a country. There’s currently an open and ongoing law enforcement investigation; a motive has yet to be determined. It would be premature for us to discuss policy when we don’t fully know all the facts or what took place last night."

Pence also tweeted in response to the shooting, saying, "To victims, families & loved ones affected by this senseless violence in Las Vegas, Karen & I are praying for you & offering our love. The hearts & prayers of the American people are with you. You have our condolences and sympathies."

Pence also thanked the "courageous first responders" for their "acts of bravery."

In Connecticut, officials who have been fighting for stricter gun control laws in the years since the tragic shooting at Sandy Hook Elementary School are calling for action on gun control following the shooting.

"Not again," U.S. Sen. Chris Murphy tweeted, saying his heart is with Las Vegas and he is sending prayers to the victims.

"Nowhere but America do horrific large-scale mass shootings happen with this degree of regularity," Murphy said in a statement. "Last night's massacre may go down as the deadliest in our nation's history, but already this year there have been more mass shootings than days in the year. ... It's time for Congress to get off its ass and do something."

Other politicians from Nevada and around the country responded as well, including former President Barack Obama and Hillary Clinton.

A tragic & heinous act of violence has shaken the #Nevada family. Our prayers are w/ the victims & all affected by this act of cowardice.